CN103249101B - A kind of method and system that LTE is redirected to from UMTS - Google Patents

A kind of method and system that LTE is redirected to from UMTS Download PDF

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CN103249101B
CN103249101B CN201210025309.7A CN201210025309A CN103249101B CN 103249101 B CN103249101 B CN 103249101B CN 201210025309 A CN201210025309 A CN 201210025309A CN 103249101 B CN103249101 B CN 103249101B
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lte
cells
measurement
message
network side
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CN103249101A (en
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黄春
杨立
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ZTE Corp
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ZTE Corp
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Abstract

The invention discloses a kind of method and system that LTE is redirected to from UMTS, for solving the problems, such as because metrical information reports network side reorientation mortality caused not in time higher under FACH state.The present invention is under forward access channel FACH state, the LTE adjacent areas met the requirements in measurement result are reported to network side by UE by way of thresholding triggering, so as to aid in network side that UE is redirected to preferable cell, the invalid measurement for avoiding UE reports, and improves the success rate of redirection.

Description

A kind of method and system that LTE is redirected to from UMTS
Technical field
The present invention relates to Universal Mobile Communication System (Universal in moving communicating field MobileTelecommunications System, UMTS) technology, and in particular, to connecing before a kind of UMTS enhancement type districts Enter to be redirected to the method for Long Term Evolution (Long TermEvolution, LTE) system from UMTS under channel CELL_FACH states And system.
Background technology
LTE is a kind of mainstream technology of 4G Long Term Evolutions, using Orthogonal Frequency Division Multiplexing (OrthogonalFrequency Division Multiplexing, OFDM) and multiple-input and multiple-output (Multiple Input MultipleOutput, MIMO), the technology such as flat architecture improves traffic rate, spectrum efficiency, the delay for reducing wireless network.When residing in If the UE in UMTS network deploys the LTE network signal of operator around detecting, operator for various reasons, Usually pay the utmost attention to as soon as possible move to user equipment (UserEquipment, UE, also referred to as terminal) in LTE network, with more Add and corresponding service is efficiently provided.
In umts, with a large amount of smart mobile phones and always online " always-on " (such as PoC, delivery email Push Email and Virtual Private Network VPN connections) business appearance, the application of CELL_FACH and residence time will be more and more wider It is general.For certain form of business, such as some transmit the frequent but less background business of data volume or special with heartbeat The service application of sign, by UE repeatedly between cell private channel CELL_DCH and CELL_FACH state migration and it is improper.For Avoid frequent state shift caused by signaling to network capacity with performance row into impact, UE will try one's best resides in FACH shapes State is got off to supporting these business.
Under FACH state, either based on network side scheduling strategy still based on UMTS signals cover due to, When there is LTE coverings, radio network controller (Radio Network Controller, RNC) can use and redirect stream Journey moves to UE in LTE cells.Redirecting flow includes：Wireless heterogeneous networks (Radios of the UE in LTE Target cells Resource Control, RRC) connection and business wireless access load-bearing (Radio Access Bearer, RAB) foundation, with And UE is in the RRC connections and the release of business RAB of UMTS cell-of-origins.Message (such as Radio Resource of LTE is redirected to when UE is received Control Connection Release RRC CONNECTION RELEASE message) when, it can be searched according to LTE targets frequency point list information therein The suitable LTE cells of rope are resident；If (existing protocol was by 10 seconds) are in the frequency point list information given within the limitation time In do not find suitable Target cell and be resident, UE will select other any cells of LTE to be resident.
From the above it can be seen that redirecting the LTE frequency point list carried in message is configured by network side, do not refer to Wireless environment residing for current UE, may be in wireless environment residing for UE and no signal or signal in the frequency point list configured It is very weak.Because at present in UMTS, UE does not support the measurement of LTE neighbor cells under FACH state, or even if introduces UMTS To the measurement of LTE neighbor cells under FACH state, but due to reporting of being measured under FACH and not in time, so RNC can not Reliably information is reported using UE measurements.If UE can not find conjunction from frequency point list of the network side in redirection information Suitable cell is resident, and can be caused the user behavior of more than 10 seconds and the uncontrollable state of whereabouts, be influenced user experience and operator Commercial interest.
The content of the invention
In view of this, it is a primary object of the present invention to provide one kind UE under FACH state to aid in network side from UMTS weights The method and system of LTE system are directed to, for solving because metrical information reports net caused not in time under FACH state Network stresses to position the problem of mortality is higher.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of method that LTE is redirected to from UMTS, this method include：
Network side configures for user equipment (UE) and is redirected to Long Term Evolution LTE system by Universal Mobile Communication System UMTS Redirect thresholding；
Network side receives the measurement result to LTE neighbor cells that UE is reported, and the measurement result that the UE is reported is LTE frequencies Measurement result exceedes the measurement result of the LTE neighbor cells of the redirection threshold value in point list；
The lateral UE of network, which is sent, redirects message, the survey for redirecting the LTE frequency point carried in message and being reported according to UE Result is measured to choose.
Further, the method further includes：
The network side is by system message or radio resource control RRC message by LTE frequency point list and the redirection Thresholding is sent to the UE.
Further, the measurement for being used for calculating forward access channel FACH is also included in the system message or RRC information The measurement cycle period parameter on opportunity；
The network side configuration UE preferentially performs the measurement of LTE frequency point, performs the measurement of other frequency points afterwards；Or it is different frequencies Point configures different measurement cycle periods, and shorter measurement cycle period is configured for LTE frequency point；
The UE measures LTE neighbor cells within the measurement opportunity of FACH, and by measurement result more than described heavy The measurement result for orienting the LTE neighbor cells of threshold value is reported to network side.
Further, the UE is reported described using event triggering reporting schemes or periodic report mode to the network side Measurement result.
Further, the message of the UE report measurement results is measurement reporting message or cell update message.
Further, the method further includes：The UE is after the redirection message is received, according to the redirection The LTE frequency point carried in message searches for LTE cells in corresponding LTE frequency point；
If the UE is found suitable for resident LTE cells, UE resides in the LTE cells and rebuilds nothing in the LTE cells After line access bearer RAB, the RAB of original UMTS cells is discharged；
If the UE, which has been searched for after all LTE frequency points, is not found suitable for resident LTE cells, the UE returns to former UMTS Cell simultaneously initiates cell updating course.
Further, it is small to search for LTE in corresponding LTE frequency point for the LTE frequency point carried according to redirecting in message The limitation time in area, is determined according to the frequency points configured by network side, search is immediately finished after described search is completed Process.
Further, the redirection thresholding includes Reference Signal Received Power RSRP thresholdings and Reference Signal Received Quality RSRQ thresholdings；Or it is described redirect thresholding for one integrated according to RSRP values and RSRQ values after thresholding.
Further, further included based on one embodiment of the present invention, the method：
The network side redirects for UE configurations and initiates time interval T；
After the UE is resident LTE cells, the RSRP and RSRQ of the LTE cells are measured, when measured value exceedes During the resident thresholding of the LTE cell settings, then network side, which is sent, is redirected to the message of UMTS and receives institute to the UE, the UE State and start timer after being redirected to the message of UMTS, the timing of the timer is the weight that the network side is UE configurations Orientation initiates time interval T；
The UE does not perform the new operation for being redirected to LTE cells before the timer expiry.
Further, further included based on another preferred embodiment of the present invention, the method：
The network side redirects for UE configurations initiates time interval T and repeatedly redirects lag time delta；
After the UE is resident LTE cells, the RSRP and RSRQ of the LTE cells are measured, when measured value exceedes During the resident thresholding of the LTE cell settings, then network side, which is sent, is redirected to the message of UMTS and receives institute to the UE, the UE State and start timer after being redirected to the message of UMTS, the timing of the timer initiates time interval for described redirect T repeatedly redirects lag time delta products plus the redirection number of statistics with described；
The UE does not perform the new operation for being redirected to LTE cells before the timer expiry.
The present invention also provides a kind of system that LTE is redirected to from UMTS, which includes：
Configuration module, positioned at network side, for being redirected to the redirection door of LTE by UMTS for user equipment (UE) configuration Limit；
Reporting module is measured, positioned at terminal, for being measured to LTE neighbor cells, when measurement result is more than described heavy When orienting threshold value, the measurement result of corresponding LTE neighbor cells is reported to network side；
Redirection module, positioned at network side, message is redirected for being sent to UE, described to redirect what is carried in message LTE frequency point is chosen according to the measurement result that UE is reported；
Search module, positioned at terminal, for after the redirection message is received, being taken according in the redirection message The LTE frequency point of band searches for LTE cells in corresponding LTE frequency point；If being found suitable for resident LTE cells by described search, The LTE cells are then resident, otherwise return to former UMTS cells.
Further, the configuration module is additionally operable to be configured to calculate for UE the measurement opportunity of forward access channel FACH Measurement cycle period M_REP parameters；
The network side configuration measurement reporting module preferentially performs the measurement of LTE frequency point, performs the measurement of other frequency points afterwards； Or different measurement cycle periods is configured for different frequent points, shorter measurement cycle period is configured for LTE frequency point；
The measurement reporting module measures LTE neighbor cells within the measurement opportunity of FACH, and by measurement result Measurement result more than the LTE neighbor cells of the redirection threshold value is reported to network side.
Further, the measurement reporting module triggers reporting schemes or periodic report mode to the network using event Side reports the measurement result；The message of report measurement results is measurement reporting message or cell update message.
Further, it is small to search for LTE in corresponding LTE frequency point for the LTE frequency point carried according to redirecting in message The limitation time in area, is determined by configuration module according to the frequency points configured, and described search module completes described search After be immediately finished search procedure.
Further, the redirection thresholding includes Reference Signal Received Power RSRP thresholdings and Reference Signal Received Quality RSRQ thresholdings；Or it is described redirect thresholding for one integrated according to RSRP values and RSRQ values after thresholding.
Further, based on one embodiment of the present invention, the configuration module is additionally operable to configure to redirect for UE to initiate Time interval T.The system also includes：
First redirects Postponement module, positioned at terminal, for being redirected to UMTS when what the UE received network side transmission Message after start timer, the timing of the timer is that the redirection that the network side is UE configurations was initiated between the time Every T；The UE does not perform the new operation for being redirected to LTE cells before the timer expiry.
Further, based on another preferred embodiment of the present invention, the configuration module, which is additionally operable to configure for UE, redirects hair Play time interval T and repeatedly redirect lag time delta.The system also includes：
Second redirects Postponement module, positioned at terminal, for being redirected to UMTS when what the UE received network side transmission Message after start timer, the timing of the timer initiates weights of the time interval T plus statistics for described redirect Orient number and repeatedly redirect lag time delta products with described；The UE does not perform new before the timer expiry It is redirected to the operation of LTE cells.
For the present invention under forward access channel FACH state, UE will be met by way of thresholding triggering in measurement result will The LTE adjacent areas asked are reported to network side, so as to aid in network side that UE is redirected to preferable cell, avoid the invalid measurement of UE Report, improve the success rate of redirection.
Brief description of the drawings
Fig. 1 is the method flow diagram that UE of the present invention auxiliary be redirected to from UMTS LTE；
Fig. 2 measures opportunity schematic diagram for the first each frequency point of arrangement provided in an embodiment of the present invention；
Fig. 3 arranges each frequency point to measure opportunity schematic diagram for second provided in an embodiment of the present invention；
Fig. 4 arranges each frequency point to measure opportunity schematic diagram for provided in an embodiment of the present invention the third；
Fig. 5 is the LTE frequency point fast search flow chart provided in an embodiment of the present invention based on UE；
Fig. 6 is the LTE frequency point fast search flow chart provided in an embodiment of the present invention based on network configuration；
Fig. 7 under UMTS CELL_FACH states provided in an embodiment of the present invention by thresholding is set control redirect table tennis The flow chart of pang effect；
Fig. 8 is redirects interval time and controls under UMTS CELL_FACH states provided in an embodiment of the present invention by setting System redirects the flow chart of ping-pong；
Fig. 9 is to initiate time interval by setting to redirect under UMTS CELL_FACH states provided in an embodiment of the present invention The flow chart of redirection ping-pong is controlled with multiple redirection lag time；
Figure 10 is by setting redirection threshold value, resetting under UMTS CELL_FACH states provided in an embodiment of the present invention The flow chart of redirection ping-pong is controlled to initiating time interval and repeatedly redirecting lag time.
Embodiment
The preferred embodiment of the present invention is illustrated below in conjunction with attached drawing, it will be appreciated that described herein preferred real Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Embodiment 1：
Fig. 1 is the flow chart for using UE auxiliary after the present invention be redirected to LTE from UMTS, including：
Step 101：UE read system messages, the slave UMTS that network side configuration is obtained from system message are redirected to LTE Relevant information, which should include redirecting thresholding and LTE frequency point list information, while can also be obtained in system message Calculate the measurement cycle period M_REP parameters on FACH measurement opportunitys；
Step 102：UE calculates the measurement opportunity that can be used for measuring LTE adjacent cells according to M_REP：
SFN=H-RNTI mod M_REP+n*M_REP
Wherein, SFN is System Frame Number, and H-RNTI is that the wireless network interim ID, M_REP that network side distributes to user are net The measurement opportunity loop parameter of network side configuration, n=0,1,2...；
UE arranges the frequency point measurement of all configurations on measurement opportunity, including UMTS frequency points, GSM frequency points, CDMA2000 frequency points, LTE frequency point.Each frequency point measurement can be as shown in Figure 2 in the arrangement on measurement opportunity.
Step 103：UE will be compared the redirection threshold value of the measurement result of LTE cells and network side configuration, see The measurement result whether examine has LTE adjacent areas exceedes the redirection threshold value that network side configures, and 102 continuation are gone to step if not Measure；If then going to step 104；
Step 104：UE is reported to LTE nearby region measurements by cell update CU processes to network side as a result, the LTE reported is adjacent Area exceedes the LTE cells for redirecting thresholding for measurement result；
In the preferred embodiment of the present invention, UE report measurement results can use event triggering reporting schemes or periodic report side Formula；The event triggers reporting schemes：The redirection thresholding is exceeded to the measurement result of LTE adjacent areas when UE is determined When, UE report measurement results are triggered, not less than not triggering then.The periodic report mode is specially：Network side configures for terminal Report cycle, terminal report cycle, periodically to network side report measurement results.
Step 105：The lateral UE of network initiates redirection process, redirects the LTE frequencies that network side configuration should be carried in message Point information；The LTE frequency point information of the network side configuration is chosen according to the measurement result that UE is reported.
Step 106：After UE receives the redirection message of network side, matched somebody with somebody according to wherein entrained LTE frequency point information LTE cells are searched in the LTE frequency point put；
Step 107：If suitable LTE cells can be resident, 108 are gone to step, otherwise UE continues search for next LTE frequency point is still resident until the frequency point search configured finishes without suitable LTE cells, goes to step 109；
Step 108：UE resides in the LTE cells and the RAB of original UMTS cells, mistake is discharged after the LTE cells rebuild RAB Journey terminates；
Step 109：Judge that the LTE frequency point of UE search configurations whether more than 10 seconds, goes to step 106 if not；Otherwise Go to step 110；
Step 110：UE searches for other and the LTE frequency point in the frequency point list of configuration and does not attempt resident；
Step 111：108 are gone to step if being resident successfully；Otherwise 112 are gone to step
Step 112：UE immediately falls back to former UMTS cells and initiates cell updating course.
Embodiment 2：
The arrangement that each frequency point of step 102 in embodiment 1 was measured in measurement opportunity can be seen that the measurement of LTE It may arrange to compare rearward so that the acquisition of measurement result has certain delay, in order to enable the transfer that UE can be preferential as soon as possible To LTE cells, it is necessary to obtain the measurement result to LTE frequency point as soon as possible, the measurement for the LTE frequency point that can give priority in arranging for, that is, surveying In the arrangement on amount opportunity, the measurement of LTE frequency point is arranged first, and then arranges the measurement of other frequency points.The arrangement on measurement opportunity Can be as shown in Figure 3.
Since existing measurement opportunity is for all frequency points, its measurement period is all identical, and all frequency points have identical Measure frequency, in order to reach by UE it is preferential it is instant be transferred to LTE cells, can be that different frequent points configure the different measurement circulating cycles Phase M_REP, shorter M-REP can be configured for the cell that system requirements preferentially measures, so that can in short at the same time To measure more numbers, so as to realize reporting immediately in shorter time.One kind is followed for the different measurements of different frequent points configuration The ring cycle schematic diagram of M REP is as shown in Figure 4.
Embodiment 3：
Fig. 5 is the LTE frequency point fast search flow chart provided in an embodiment of the present invention based on UE；
Step 301：The lateral UE of network initiates redirection process, and the LTE frequency point letter that UE is reported should be carried by redirecting in message Breath；
Step 302：After UE receives the redirection message of network side, matched somebody with somebody according to wherein entrained LTE frequency point information LTE cells are searched in the LTE frequency point put；
Step 303：After search, if suitable LTE cells can be resident, go to step 304, otherwise UE after The continuous next LTE frequency point of search is still resident until the frequency point search configured finishes without suitable LTE cells, goes to step 305；
Step 304：UE resides in the LTE cells and the RAB of original UMTS cells is discharged after the LTE cells rebuild RAB；
Step 305：UE immediately falls back to former UMTS cells and initiates cell updating course.
Embodiment 4：
Fig. 6 provides the LTE frequency point fast search flow chart based on network configuration for the embodiment of the present invention：
Step 401：The lateral UE of network initiates redirection process, and the LTE frequency point letter that UE is reported should be carried by redirecting in message Breath and the time t for allowing UE to search for；
The time t of permission UE search can be configured according to the frequency points configured；
The time t of permission UE search can also be configured by system message, or by network side and UE in advance about It is fixed.
Step 402：After UE receives the redirection message of network side, matched somebody with somebody according to wherein entrained LTE frequency point information LTE cells are searched in the LTE frequency point put；
Step 403：If suitable LTE cells can be resident, 404 are gone to step, otherwise UE continues search for next LTE frequency point is still resident until the frequency point search configured finishes without suitable LTE cells, goes to step 405；
Step 404：UE resides in the LTE cells and the RAB of original UMTS cells, weight is discharged after the LTE cells rebuild RAB Orientation process is completed；
Step 405：UE judges whether the search time for exceeding network side configuration, and 402 are gone to step if not；Otherwise turn Step 406；
Step 406：UE immediately falls back to former UMTS cells and initiates cell updating course.
Embodiment 5：
Fig. 7 under UMTS CELL_FACH states by thresholding is set control redirect ping-pong flow chart.
Step 501：UE read system messages obtain the redirection thresholding by RRC information, wherein also including needing The frequency point list for the LTE cells to be measured.
Step 502：UE measures Reference Signal Received Power (the Reference Signal Received of LTE cells Power, RSRP) and Reference Signal Received Quality (Reference Signal Receiving Quality, RSRQ).
Step 503：UE is compared according to the RSRP and RSRQ measured, and with the redirection thresholding.
If the redirection thresholding of configuration includes the thresholding of RSRP and RSRQ respectively, LTE neighbor cells will be surveyed RSRP and RSRQ measurement result respectively compared with RSRP thresholdings and RSRQ thresholdings, if the measurement of RSRP and RSRQ As a result respective thresholding is above, then goes to step 504, otherwise goes to step 502；
If configuration the redirection thresholding be a comprehensive thresholding, according to the result of RSRP and RSRQ synthesis after with The synthesis thresholding of this configuration is compared, this thresholding then goes to step 504 if more than, otherwise goes to step 502；
Step 504：The lateral UE of network, which is sent, is redirected to LTE message.Process terminates.
If RSRP and the resident thresholding of RSRQ that the redirection threshold reference that is configured LTE is configured by cell Value, then if having reached the redirection thresholding, being redirected to after LTE cells should be able to also reach cell RSRP's and RSRQ Thresholding, so as to be resident industry business of going forward side by side in the cell, it is therefore prevented that the ping-pong of redirection.
The method of the embodiment needs the UE of FACH state to measure LTE cells when residing in UMTS, and is resident LTE Since the change of wireless environment does not ensure that the threshold requirement that can yet meet in LTE cells in LTE after cell.
Embodiment 6：
Fig. 8 is redirects interval time and redirects ping-pong to control under UMTS CELL_FACH states by setting Flow chart.
Step 601：UE in UMTS cells read system message or by RRC information obtain redirect initiate the time between Every T；
Step 602：Since covering or service reason need to move to LTE cells, the lateral UE of network is sent to be reset UMTS To LTE message.
Step 603：UE searches for LTE frequency point and resides in LTE cells, and resident rear UE needs to measure RSRP and RSRQ values.
Step 604：Whether the RSRP and RSRQ that UE compares measurement exceed the resident thresholding of each self-configuring, the resident threshold value To be configured in LTE cells.If it exceeds the resident thresholding then represents that cell radio link quality meets the requirements, and go to step 605； Otherwise 606 are gone to step.
Step 605：UE reside in LTE cells go forward side by side industry business, redirect flow terminate.
Step 606：Network side sends the message for being redirected to UMTS to UE.UE starts timer t after receiving message.
Step 607：The redirection that UE compares timer t and configured initiates time interval T, is gone to step if t ＞ T 602；Otherwise 608. are gone to step
Step 608：UE continues in UMTS cells are resided in, and goes to step 607.
The method of the embodiment is not required the UE of FACH state to measure LTE cells when residing in UMTS, but eventually also It is that possible be rattled with cycle T.
Embodiment 7：
Fig. 9 is when redirecting initiation time interval by setting under UMTS CELL_FACH states and repeatedly redirect sluggish Between come control redirect ping-pong flow chart.
Step 701：UE in UMTS cells read system message or by RRC information obtain redirect initiate the time between Every T and multiple redirection lag time value delta.
Step 702：Since covering or service reason need to move to LTE cells, the lateral UE of network is sent to be reset UMTS To LTE message.
Step 703：UE searches for LTE frequency point and resides in LTE cells, and resident rear UE needs to measure RSRP and RSRQ values.
Step 704：UE compare measurement RSRP and RSRQ whether exceed each self-configuring thresholding, the threshold value for LTE it is small Configured in area.If it exceeds thresholding then represents that cell radio link quality meets the requirements, and go to step 305；Otherwise go to step 306。
Step 705：UE reside in LTE cells go forward side by side industry business, redirect flow terminate.
Step 706：Network sends the message for being redirected to UMTS to UE.UE starts timer t after receiving message and counts The frequency n of redirection.
Step 707：Compare timer t and the redirection that is configured initiates time interval T and by redirection number and more The secondary lag time n*delta for redirecting hysteresis and being determined, 702 are gone to step if t ＞ T+n*delta；Otherwise go to step 708.
Step 708：UE continues in UMTS cells are resided in and goes to step 707.
The method of the embodiment is not required the UE of FACH state to measure LTE cells when residing in UMTS, while with table tennis The increasing of pang number can increase UE and initiate to be redirected to the time of LTE again.This embodiment eventually or may with cycle T+ The time of n*delta rattles, only rattle number it is more, table tennis it is of long duration longer.
Embodiment 8：
Figure 10 is redirects threshold value under UMTS CELL_FACH states by setting, redirection initiates time interval and more It is secondary to redirect lag time to control the flow chart of redirection ping-pong.
Step 801：UE read system message or the thresholding initiated by RRC information acquisition redirection in UMTS cells Value, redirect and initiate time interval and repeatedly redirect time lag value delta, wherein also including needing the LTE cells measured.
Step 802：UE measures the RSRP and RSRQ of LTE cells.
Step 803：UE is compared according to the RSRP and RSRQ measured, and with threshold value.
If what is configured is the thresholding of RSRP and RSRQ respectively, the measurement result of RSRP and RSRQ are compared, such as Fruit has been above respective thresholding and has then gone to step 804, otherwise goes to step 802；
If configuration is a comprehensive thresholding, the thresholding configured after being integrated according to the result of RSRP and RSRQ with this It is compared, this thresholding then goes to step 804 if more than, otherwise goes to step 802；
Step 804：The lateral UE of network, which is sent, is redirected to LTE message.
Step 805：UE searches for LTE frequency point and resides in LTE cells, and resident rear UE needs to measure RSRP and RSRQ values.
Step 806：UE compare measurement RSRP and RSRQ whether exceed each self-configuring thresholding, the threshold value for LTE it is small Configured in area.If it exceeds thresholding then represents that cell radio link quality meets the requirements, and go to step 807；Otherwise go to step 808。
Step 807：UE reside in LTE cells go forward side by side industry business, redirect flow terminate.
Step 808：Network sends the message for being redirected to UMTS to UE.UE starts timer t after receiving message and counts The frequency n of redirection.
Step 809：Compare timer t and the redirection that is configured initiate timer threshold T and by redirection number and The lag time n*delta that hysteresis is determined, 802 are gone to step if t ＞ T+n*delta；Otherwise 808. are gone to step
Step 810：UE continues in UMTS cells are resided in and goes to step 809.
The method of the embodiment is from when redirecting the threshold value initiated, redirecting initiation time interval and repeatedly redirect Between the aspect of hysteresis delta tri- to prevent and postpone to redirect when ping-pong generation, the effect that three factors are superimposed makes The method of obtaining is most effective, but also brings the complexity of realization.
Embodiment 9：
The embodiment provides a kind of system that LTE is redirected to from UMTS, which includes：Positioned at the configuration mould of network side Block, redirection module, positioned at the measurement reporting module and search module of terminal；
The configuration module is used for the redirection thresholding for being redirected to LTE by UMTS for user equipment (UE) configuration；
The redirection module, which is used to send to UE, redirects message, described to redirect the LTE frequency point root carried in message The measurement result that is reported according to UE is chosen；
The measurement reporting module, for being measured to LTE neighbor cells, when measurement result exceedes the redirection door During limit value, the measurement result of corresponding LTE neighbor cells is reported to network side；
Described search module, for after the redirection message is received, redirecting what is carried in message according to described LTE frequency point searches for LTE cells in corresponding LTE frequency point；If being found suitable for resident LTE cells by described search, stay The LTE cells are left to, otherwise return to former UMTS cells.
Preferably, the configuration module is additionally operable to be configured to calculate for UE the measurement opportunity of forward access channel FACH Measure cycle period M_REP parameters；The network side configuration measurement reporting module preferentially performs the measurement of LTE frequency point, rear to perform The measurement of other frequency points；Or different measurement cycle periods is configured for different frequent points, configuring shorter measurement for LTE frequency point follows The ring cycle；
The measurement reporting module measures LTE neighbor cells within the measurement opportunity of FACH, and by measurement result Measurement result more than the LTE neighbor cells of the redirection threshold value is reported to network side.
Preferably, the measurement reporting module triggers reporting schemes or periodic report mode to the network side using event Report the measurement result；The message of report measurement results is measurement reporting message or cell update message.
Preferably, the LTE frequency point carried according to redirecting in message searches for LTE cells in corresponding LTE frequency point The limitation time, determined by configuration module according to the frequency points configured, described search module is after described search is completed It is immediately finished search procedure.
Preferably, the redirection thresholding includes Reference Signal Received Power RSRP thresholdings and Reference Signal Received Quality RSRQ thresholdings；Or it is described redirect thresholding for one integrated according to RSRP values and RSRQ values after thresholding.
Preferably, the configuration module is additionally operable to configure to redirect for UE to initiate time interval T.The system also includes：
First redirects Postponement module, positioned at terminal, for being redirected to UMTS when what the UE received network side transmission Message after start timer, the timing of the timer is that the redirection that the network side is UE configurations was initiated between the time Every T；The UE does not perform the new operation for being redirected to LTE cells before the timer expiry.
Preferably, in another preferred embodiment, the configuration module was additionally operable between the UE configuration redirection initiation times Every T and multiple redirection lag time delta.The system also includes：
Second redirects Postponement module, positioned at terminal, for being redirected to UMTS when what the UE received network side transmission Message after start timer, the timing of the timer initiates weights of the time interval T plus statistics for described redirect Orient number and repeatedly redirect lag time delta products with described；The UE does not perform new before the timer expiry It is redirected to the operation of LTE cells.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.

Claims (17)

  1. A kind of 1. method that LTE is redirected to from UMTS, it is characterised in that
    Network side configures for user equipment (UE) and is redirected to resetting for Long Term Evolution LTE system by Universal Mobile Communication System UMTS To thresholding；
    Network side receives the measurement result to LTE neighbor cells that UE is reported, and the measurement result that the UE is reported arranges for LTE frequency point Measurement result exceedes the measurement result of the LTE neighbor cells of the redirection threshold value in table；
    The lateral UE of network, which is sent, redirects message, the measurement knot for redirecting the LTE frequency point carried in message and being reported according to UE Fruit is chosen；
    UE searches for LTE cells in the LTE frequency point configured；
    The network side configuration UE preferentially performs the measurement of LTE frequency point, performs the measurement of other frequency points afterwards；Or match somebody with somebody for different frequent points Different measurement cycle periods is put, shorter measurement cycle period is configured for LTE frequency point.
  2. 2. according to the method described in claim 1, it is characterized in that, the method further includes：
    The network side is by system message or radio resource control RRC message by LTE frequency point list and the redirection thresholding It is sent to the UE.
  3. 3. according to the method described in claim 2, it is characterized in that, also included in the system message or RRC information based on Calculate the measurement cycle period parameter on the measurement opportunity of forward access channel FACH；
    The UE measures LTE neighbor cells within the measurement opportunity of FACH, and measurement result is exceeded the redirection The measurement result of the LTE neighbor cells of threshold value is reported to network side.
  4. 4. according to the method described in claim 1, it is characterized in that,
    The UE reports the measurement result using event triggering reporting schemes or periodic report mode to the network side.
  5. 5. according to the method described in claim 1, it is characterized in that,
    The message of the UE report measurement results is measurement reporting message or cell update message.
  6. 6. according to the method described in claim 1, it is characterized in that, the UE searches for LTE cells in the LTE frequency point configured Afterwards, the method further includes：
    If the UE is found suitable for resident LTE cells, UE resides in the LTE cells and is rebuild in the LTE cells and wirelessly connect Enter after carrying RAB, discharge the RAB of original UMTS cells；
    If the UE has been searched for after all LTE frequency points and has not been found suitable for resident LTE cells, the UE returns to former UMTS cells And initiate cell updating course.
  7. 7. according to the method described in claim 6, it is characterized in that,
    The LTE frequency point carried according to redirecting in message searches for the limitation time of LTE cells in corresponding LTE frequency point, Determined by network side according to the frequency points configured, search procedure is immediately finished after described search is completed.
  8. 8. the method according to claim 1 or 6, it is characterised in that
    The redirection thresholding includes Reference Signal Received Power RSRP thresholdings and Reference Signal Received Quality RSRQ thresholdings；Or institute State and redirect the thresholding after thresholding is integrated for one according to RSRP values and RSRQ values.
  9. 9. according to the method described in claim 8, it is characterized in that, the method further includes：
    The network side redirects for UE configurations and initiates time interval T；
    After the UE is resident LTE cells, the RSRP and RSRQ of the LTE cells are measured, when measured value exceedes the LTE During the resident thresholding of cell setting, then network side, which is sent, is redirected to the message of UMTS and receives described heavy to the UE, the UE Start timer after being directed to the message of UMTS, the timing of the timer is the redirection that the network side is UE configurations Initiate time interval T；
    The UE does not perform the new operation for being redirected to LTE cells before the timer expiry.
  10. 10. according to the method described in claim 8, it is characterized in that, the method further includes：
    The network side redirects for UE configurations initiates time interval T and repeatedly redirects lag time delta；
    After the UE is resident LTE cells, the RSRP and RSRQ of the LTE cells are measured, when measured value exceedes the LTE During the resident thresholding of cell setting, then network side, which is sent, is redirected to the message of UMTS and receives described heavy to the UE, the UE Start timer after being directed to the message of UMTS, the timing of the timer adds for the initiation time interval T that redirects The redirection number of upper statistics repeatedly redirects lag time delta products with described；
    The UE does not perform the new operation for being redirected to LTE cells before the timer expiry.
  11. 11. a kind of system that LTE is redirected to from UMTS, it is characterised in that the system includes：
    Configuration module, positioned at network side, for being redirected to the redirection thresholding of LTE by UMTS for user equipment (UE) configuration；
    Reporting module is measured, positioned at terminal, for being measured to LTE neighbor cells, when measurement result exceedes the redirection During threshold value, the measurement result of corresponding LTE neighbor cells is reported to network side；
    Redirection module, positioned at network side, message is redirected for being sent to UE, described to redirect the LTE frequencies carried in message The point measurement result that is reported according to UE is chosen；
    Search module, positioned at terminal, for after the redirection message is received, redirecting what is carried in message according to described LTE frequency point searches for LTE cells in corresponding LTE frequency point；If being found suitable for resident LTE cells by described search, stay The LTE cells are left to, otherwise return to former UMTS cells；
    The network side configuration measurement reporting module preferentially performs the measurement of LTE frequency point, performs the measurement of other frequency points afterwards；Or it is Different frequent points configure different measurement cycle periods, and shorter measurement cycle period is configured for LTE frequency point.
  12. 12. system according to claim 11, it is characterised in that
    The configuration module is additionally operable to be configured to calculate for UE the measurement circulating cycle on the measurement opportunity of forward access channel FACH Phase M_REP parameter；
    The measurement reporting module measures LTE neighbor cells within the measurement opportunity of FACH, and measurement result is exceeded The measurement result of the LTE neighbor cells for redirecting threshold value is reported to network side.
  13. 13. system according to claim 11, it is characterised in that
    The measurement reporting module reports the survey using event triggering reporting schemes or periodic report mode to the network side Measure result；The message of report measurement results is measurement reporting message or cell update message.
  14. 14. system according to claim 11, it is characterised in that
    The LTE frequency point carried according to redirecting in message searches for the limitation time of LTE cells in corresponding LTE frequency point, Determined by configuration module according to the frequency points configured, described search module is immediately finished search after described search is completed Process.
  15. 15. system according to claim 11, it is characterised in that
    The redirection thresholding includes Reference Signal Received Power RSRP thresholdings and Reference Signal Received Quality RSRQ thresholdings；Or institute State and redirect the thresholding after thresholding is integrated for one according to RSRP values and RSRQ values.
  16. 16. system according to claim 11, it is characterised in that
    The configuration module is additionally operable to configure to redirect for UE to initiate time interval T；
    The system also includes：
    First redirects Postponement module, positioned at terminal, for being redirected to disappearing for UMTS when what the UE received network side transmission Start timer after breath, the timing of the timer is that the redirection that the network side is UE configurations initiates time interval T； The UE does not perform the new operation for being redirected to LTE cells before the timer expiry.
  17. 17. system according to claim 11, it is characterised in that
    The configuration module is additionally operable to configure to redirect for UE to initiate time interval T and repeatedly redirect lag time delta；
    The system also includes：
    Second redirects Postponement module, positioned at terminal, for being redirected to disappearing for UMTS when what the UE received network side transmission Start timer after breath, the timing of the timer initiates redirections of the time interval T plus statistics for described redirect Number repeatedly redirects lag time delta products with described；The UE does not perform new reset before the timer expiry To the operation to LTE cells.
CN201210025309.7A 2012-02-06 2012-02-06 A kind of method and system that LTE is redirected to from UMTS Expired - Fee Related CN103249101B (en)

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